今天要说的是为Android设备添加重启、飞行模式、静音模式按钮，客户需求中需要添加这项功能，在长按电源键弹出的菜单中没有这些选项，谨以此文记录自己添加这个功能的过程。
首先找到长按电源键弹出的对话框，在frameworks\base\policy\src\com\android\internal\policy\impl\GlobalActions.java文件中，修改createDialog（）方法。
/**
* Create the global actions dialog.
* @return A new dialog.
*/
private AlertDialog createDialog() {
// Simple toggle style if there's no vibrator, otherwise use a tri-state
if (!mHasVibrator) {
mSilentModeAction = new SilentModeToggleAction();
} else {
mSilentModeAction = new SilentModeTriStateAction(mContext, mAudioManager, mHandler);
}
mAirplaneModeOn = new ToggleAction(
R.drawable.ic_lock_airplane_mode,
R.drawable.ic_lock_airplane_mode_off,
R.string.global_actions_toggle_airplane_mode,
R.string.global_actions_airplane_mode_on_status,
R.string.global_actions_airplane_mode_off_status) {
void onToggle(boolean on) {
if (mHasTelephony && Boolean.parseBoolean(
SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) {
mIsWaitingForEcmExit = true;
// Launch ECM exit dialog
Intent ecmDialogIntent =
new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS, null);
ecmDialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivity(ecmDialogIntent);
} else {
changeAirplaneModeSystemSetting(on);
}
}
@Override
protected void changeStateFromPress(boolean buttonOn) {
if (!mHasTelephony) return;
// In ECM mode airplane state cannot be changed
if (!(Boolean.parseBoolean(
SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE)))) {
mState = buttonOn ? State.TurningOn : State.TurningOff;
mAirplaneState = mState;
}
}
public boolean showDuringKeyguard() {
return true;
}
public boolean showBeforeProvisioning() {
return false;
}
};
onAirplaneModeChanged();
mItems = new ArrayList<Action>();
// first: power off
mItems.add(
new SinglePressAction(
com.android.internal.R.drawable.ic_lock_power_off,
R.string.global_action_power_off) {
public void onPress() {
// shutdown by making sure radio and power are handled accordingly.
mWindowManagerFuncs.shutdown();
}
public boolean onLongPress() {
mWindowManagerFuncs.rebootSafeMode();
return true;
}
public boolean showDuringKeyguard() {
return true;
}
public boolean showBeforeProvisioning() {
return true;
}
});
//edited by ouyang started
// next: reboot
mItems.add(
new SinglePressAction(
com.android.internal.R.drawable.ic_lock_power_off,
R.string.global_action_reboot) {
public void onPress() {
//reboot
mWindowManagerFuncs.reboot(true);
}
public boolean onLongPress() {
mWindowManagerFuncs.rebootSafeMode();
return true;
}
public boolean showDuringKeyguard() {
return true;
}
public boolean showBeforeProvisioning() {
return true;
}
});
//edited by ouyang ended
// next: airplane mode
mItems.add(mAirplaneModeOn);
// last: silent mode
if (SHOW_SILENT_TOGGLE) {
mItems.add(mSilentModeAction);
}
//edited by ouyang ended
List<UserInfo> users = mContext.getPackageManager().getUsers();
if (users.size() > 1) {
UserInfo currentUser;
try {
currentUser = ActivityManagerNative.getDefault().getCurrentUser();
} catch (RemoteException re) {
currentUser = null;
}
for (final UserInfo user : users) {
boolean isCurrentUser = currentUser == null
? user.id == 0 : (currentUser.id == user.id);
SinglePressAction switchToUser = new SinglePressAction(
com.android.internal.R.drawable.ic_menu_cc,
(user.name != null ? user.name : "Primary")
+ (isCurrentUser ? " \u2714" : "")) {
public void onPress() {
try {
ActivityManagerNative.getDefault().switchUser(user.id);
getWindowManager().lockNow();
} catch (RemoteException re) {
Log.e(TAG, "Couldn't switch user " + re);
}
}
public boolean showDuringKeyguard() {
return true;
}
public boolean showBeforeProvisioning() {
return false;
}
};
mItems.add(switchToUser);
}
}
mAdapter = new MyAdapter();
final AlertDialog.Builder ab = new AlertDialog.Builder(mContext);
ab.setAdapter(mAdapter, this)
.setInverseBackgroundForced(true);
final AlertDialog dialog = ab.create();
dialog.getListView().setItemsCanFocus(true);
dialog.getListView().setLongClickable(true);
dialog.getListView().setOnItemLongClickListener(
new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position,
long id) {
return mAdapter.getItem(position).onLongPress();
}
});
dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
dialog.setOnDismissListener(this);
return dialog;
}
在GlobalActionsDialog方法可以看 mItems.add这个方法是添加菜单选项的，该菜单的添加的第一个选项就是关机选项。可以仿照关机的Item添加一个重启的选项，如上面的代码所示；这样就解决了在长按的电源键弹出的对话框中添加一个重启选项了。当然这仅仅是添加一个显示而已，接下来就为这个选项添加逻辑控制代码了。
在上面的代码中使用的mWindowManagerFuncs.reboot方法和R.string.global_action_reboot资源（资源的添加放到最后说），默认是不存在的，所以需要在自己手动添加。
2、
首先在找到WindowManagerFuncs这个所在的位置，在frameworks\base\core\java\android\view\WindowManagerPolicy.java中
public interface WindowManagerFuncs {
public static final int LID_ABSENT = -1;
public static final int LID_CLOSED = 0;
public static final int LID_OPEN = 1;
/**
* Ask the window manager to re-evaluate the system UI flags.
*/
public void reevaluateStatusBarVisibility();
/**
* Add a fake window to the window manager. This window sits
* at the top of the other windows and consumes events.
*/
public FakeWindow addFakeWindow(Looper looper,
InputEventReceiver.Factory inputEventReceiverFactory,
String name, int windowType, int layoutParamsFlags, boolean canReceiveKeys,
boolean hasFocus, boolean touchFullscreen);
/**
* Returns a code that describes the current state of the lid switch.
*/
public int getLidState();
/**
* Creates an input channel that will receive all input from the input dispatcher.
*/
public InputChannel monitorInput(String name);
/**
* Switch the keyboard layout for the given device.
* Direction should be +1 or -1 to go to the next or previous keyboard layout.
*/
public void switchKeyboardLayout(int deviceId, int direction);
public void shutdown();
public void rebootSafeMode();
//edited by ouyang
public void reboot(boolean confirm);
}
添加reboot方法。
但这只是添加接口而已，它的具体实现在呢？找了许久在
frameworks\base\services\java\com\android\server\wm\windowManagerService.java中找到了这个接口的实现。
在该类中加入reboot()方法，该方法调用ShutdownThread的reboot方法
// Called by window manager policy. Not exposed externally.
@Override
public void shutdown() {
ShutdownThread.shutdown(mContext, true);
}
//edited by ouyang start
public void reboot(boolean confirm){
ShutdownThread.reboot(mContext,null,confirm);
}
//edited by ouyang end
同样在仿照关机的原理添加reboot的具体实现代码，既然在ShutdownThread这个类中提供了shutdown和rebootSafeMode的方法，那按理也应该有reboot的方法，或者类似reboot的方法。找到Shutdown.java文件，在frameworks\base\services\java\com\android\server\power\ShutdownThread.java中，
/**
* Request a clean shutdown, waiting for subsystems to clean up their
* state etc. Must be called from a Looper thread in which its UI
* is shown.
*
* @param context Context used to display the shutdown progress dialog.
* @param reason code to pass to the kernel (e.g. "recovery"), or null.
* @param confirm true if user confirmation is needed before shutting down.
*/
public static void reboot(final Context context, String reason, boolean confirm) {
mReboot = true;
mRebootSafeMode = false;
mRebootReason = reason;
shutdownInner(context, confirm);
}
其中提供了一个静态的reboot方法，所以在windowManagerService.java中的reboot实现中直接调用ShutdownThread中reboot即可。
public static void reboot(final Context context, String reason, boolean confirm)；有三个参数，后两个参数解释如下： reason 如果值为是null，正常重启；如果是recovery，系统重启进入recovery mode ；confirm为true显示关机提示框，需要用户【确认】；false不显示提示框，直接关机。
到此重启功能基本上可以使用了（除资源还没有添加之外），但是此时选择重启选项时，其提示还是不够关机的提示，所以还要修改选择“重启”时的对话框的提示。
在frameworks\base\services\java\com\android\server\pm\ShutdownThread.java中
修改shutdownInner方法
static void shutdownInner(final Context context, boolean confirm) {
// ensure that only one thread is trying to power down.
// any additional calls are just returned
synchronized (sIsStartedGuard) {
if (sIsStarted) {
Log.d(TAG, "Request to shutdown already running, returning.");
return;
}
}
final int longPressBehavior = context.getResources().getInteger(
com.android.internal.R.integer.config_longPressOnPowerBehavior);
//edited by ouyang started
final int resourceId =mReboot
?com.android.internal.R.string.reboot_confirm
:(mRebootSafeMode
? com.android.internal.R.string.reboot_safemode_confirm
: (longPressBehavior == 2
? com.android.internal.R.string.shutdown_confirm_question
: com.android.internal.R.string.shutdown_confirm));
//edited by ouyang ended
/**
//resource code
final int resourceId = mRebootSafeMode
? com.android.internal.R.string.reboot_safemode_confirm
: (longPressBehavior == 2
? com.android.internal.R.string.shutdown_confirm_question
: com.android.internal.R.string.shutdown_confirm);
*/
Log.d(TAG, "Notifying thread to start shutdown longPressBehavior=" + longPressBehavior);
if (confirm) {
final CloseDialogReceiver closer = new CloseDialogReceiver(context);
final AlertDialog dialog = new AlertDialog.Builder(context)
/*
//source code
.setTitle(mRebootSafeMode
? com.android.internal.R.string.reboot_safemode_title
: com.android.internal.R.string.power_off)
.setMessage(resourceId)
*/
//edited by ouyang started
.setTitle(mReboot
?com.android.internal.R.string.global_action_reboot
:(mRebootSafeMode
? com.android.internal.R.string.reboot_safemode_title
: com.android.internal.R.string.power_off))
.setMessage(resourceId)
//edited by ouyang ended
.setPositiveButton(com.android.internal.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
beginShutdownSequence(context);
}
})
.setNegativeButton(com.android.internal.R.string.no, null)
.create();
closer.dialog = dialog;
dialog.setOnDismissListener(closer);
dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
dialog.show();
} else {
beginShutdownSequence(context);
}
}
至此关于代码部分的改动全部完成，接下就添加需要添加使用到的资源了，就是其中使用的字符串，为了简单起见就添加了英文和简体中文：
在对应的资源文件中添加：
frameworks\base\core\res\res\values\strings.xml
<!--edited by ouyang started-->
<string name="global_action_reboot">Reboot</string>
<string name="reboot_confirm">Do you want to reboot your device?</string>
<!--edited by ouyang started-->frameworks\base\core\res\res\values-zh-rCN\
strings.xml
<!--edited by ouyang started-->
<string name="global_action_reboot">重启</string>
<string name="reboot_confirm">您要重新启动您的设备吗？</string>
<!--edited by ouyang started-->
现在已经添加了好这些资源，但是现在还不能使用，此时编译会出现找不到该资源的错误，还需要在 frameworks\base\core\res\res\values\public.xml 文件中进行资源声明：
<java-symbol type="string" name="global_action_reboot" /> <java-symbol type="string" name="reboot_confirm" />
最后还得确认 framework/base/core/res/res/values/config.xml文件中的config_longPressOnPowerBehavior属性变成1
最后重新编译即可
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作者：欧阳鹏 欢迎转载，与人分享是进步的源泉！
转载请保留原文地址：http://blog.csdn.net/ouyang_peng
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